Yu-Ju (Jade) Chang
Hi, My name is Jade. Just like craving beautiful jade from common stones, I also like to find insights from data to serving as a basis for design new products and business decisions, and to help companies developing and implementing data-driven solutions. My life goal is to create things that maximize people's happiness and foster a society where people can live equally.
[email protected]
(412) 440-7508
Pittsburgh, USA
Skills & Products
Data Analysis
- Experience in discovering interesting insights based on data. Example: Find the most dangerous area in Pittsburgh
- Experience in data cleaning, including anomalous data detection and correction. Example: Clean and Evaluate Pittsburgh Police Arrest Data
- Experience in Mobile Data Analysis. Example: Analyzing mobile data I collected by my phone.
- Team project: Air pollution in China
Computer System
- Developed a data structure to implement malloc, calloc, realloc, free functions in C and Assembly to optimize memory utilization and throughput by reducing external and internal fragmentation.
- Designed a HTTP proxy server in C that caches web objects to deal with multiple concurrent requests. Implemented synchronization primitive like mutex, semaphore and reader-writer locks to ensure thread-safe.
- Implemented a Unix shell program in C that supports job control, I/O redirection and signal handling.
Machine Learning & NLP
- Used Machine Learning and NLP techniques to successfully extract key information in the context of legal documents for automatic summarization with Python NLTK and Scikit-learn.
- Developed machine learning models in Python to detect faulty motors based on electronic signals. It achieved 95 percent accuracy in detection.
Python
- Wrote HTML Parser to get stock prices of companies, the definition of vocabularies and the product information of smartphones from websites. Website1. Website2. Website3.
- Implement mini-games in 5 hours for practicing python. Example: Tetris.
- Implement machine learning algorithms(Naive Bayes, Decision Tree, Neural Network and Forward–backward algorithm).
UX/UI Design
- Familiar with user study and interviews.
- Designed a multi-dimensional input method for rotating, scaling and translating a target square onto the targeting square on ab smart phone. Video
- Designed an interface that uses smart phone sensors to enable 4-way and 2-way selection, respectively. Required not use touch screen and not use same sensors. Video
- Designed a text entry method for smart watches which size are 1 inch by 1 inch. Video
- Designed a method to increase speed and accuracy of user clicks. Video
Django
- Implement websites which has functions as following:
- real-time multiple users online drawing game: Users are randomly assigned in a drawing game to be a drawer/guesser to draw/guess a certain object. Websocket implemented with Django Channels was used for all users to real-time see the strokes made by drawers.
- shared stream
- registration
- login in and log out
- individual profile pages
- file uploading
- sending email to confirm registration
- customized error pages for error handling
- posting messages (with limitation of certain amount of characters.)
- user can comment on every post
- user can follow and unfollow other users
- comments will be automatically updated for every 5 seconds
Qualitative Research
- Rich experience in field study of online games.
- Rich experience in semi-structured interviews. Conducted more than 30 interviews in 3 months. Result: Becoming a Player: How Collaboration (Re-)creates Social Order in Online Games
- Rich experience in textual analysis of analyzing discussion in online forums.
- Experience in analyze business strategies. Example: Smartphone Product Strategy Benchmarking: Lenovo, Huawei, Coolpad
Java
- Implement different data structures without importing Java Collections, including Array, Sorted Linked List, Hash Table and Binary Search Tree.
- Implement a shopping website with following functions:
- registration
- log in and log out
- shopping cart
- captcha
- ID verification(for Taiwanese users)
Quantitative Research
- Experience in survey design and distribution. Publication: Study dining habits of Taiwanese students
- Experience in regression models, instrumental variables method, regression discontinuity Design, and difference-in-differences.
JavaScript/ JQuery
- Implement a calculator which has following functions:
- warning message and auto reset for illegal input
- updating itself to newest operator
- continuously operation
Git
- Experience in Git version control. Familiar with comments as: git add, git commit, git push, etc.
SQL
- Used SQL for querying user data and product data from database to display information on webpages.
Linux/GDB
- Experience in Linux commands.
- Experience in using Linux tools and GDB for debugging. Including using objdump to see assembling code, checking memory status and set breakpoints.
CSS
- Experience in adding hover motion buttons, changing colors etc.
- Experience in using Bootstrap.
Writing & Editing
Besides programming and UX study, I also like writing. My essays were published on China Times and Mingdao Magazine. I am also a China Times Literature Prize Winner. One of my articles selected by 103 九歌散文選(Selected Prose 2014). See the book.
For editing, I was the Chief Editor of the first graduate journal. 3000 of the journal were distributed to all graduates in the graduation ceremony. See the journal.
Education
Carnegie Mellon University, School of Computer Science
Master of Computational Data Science, GPA 3.7/4.3
Specialized in Human Centered Data Science
(August 2016 - Present)
- Courses:
- Machine Learning
- Introduction to Computer Systems
- Data Structures for Application Programmers
- Web Application Development
- Designing Human-centered Software
- Interactive Data Science
- Database Systems
- Learning Analytics and Educational Data Science
- Attend: Tech4Society (Volunteers to create platforms that benefits our community. A subgroup of Students for Urban Data Systems.)
- Machine Learning
- Introduction to Computer Systems
- Data Structures for Application Programmers
- Web Application Development
- Designing Human-centered Software
- Interactive Data Science
- Database Systems
- Learning Analytics and Educational Data Science
National Taiwan University
Master of Arts (M.A.), Sociology, GPA 4.0/4.0
(February 2010 - July 2015)
Minored in European and EU studies
- Ranked as first in program.
- Received Excellent TA award, 2011.
- Thesis: "Becoming a Player: How Collaboration (Re-)creates Social Order in Online Games", 2014.
- Courses:
- Advanced Social Statistics
- Methodology of Sociology
- Comparative Sociology and Methods
Freie Universität Berlin
Exchange Student
Educational Science and Psychology
(October 2012 - August 2013)
- Received Erasmus Scholarship, Multilingualism and Multiculturalism Program, funded by EuropeanCommission, merit-based.
National Taiwan University
Bachelor of Arts (B.A.), Sociology, major GPA 3.9/4.0
(September 2006 - Janunary 2010)
- Received National Science Council Research Scholarship (NSC98-2815-C002-106-H), 2009-2010,
- Received Presidential Award, 2008.
- Attend: Student Association (Chief Editor of graduate journal at Graduates Association, Vice-President of Culture Ministry at Student Association.)
Experience
Rockwell Automation
Industry Analyst
(November 2015 - November 2014)
- Analyzed data from companies' annual reports and interviewed manufacturers involved in supply chain to estimate mobile phone sales quarterly.
- Collected data from news and IT professionals to identify potential market and related strategies.
- Published and presented on-demand business analyses to clients.
- Provided analyses of Taiwanese tech companies to help the formation of Taiwan’s technology policies and a long-term technology strategy.
Institute for Information Industry
Industry Analyst
(November 2015 - November 2014)
- Analyzed data from companies' annual reports and interviewed manufacturers involved in supply chain to estimate mobile phone sales quarterly.
- Collected data from news and IT professionals to identify potential market and related strategies.
- Published and presented on-demand business analyses to clients.
- Provided analyses of Taiwanese tech companies to help the formation of Taiwan’s technology policies and a long-term technology strategy.
National Taiwan University
Teaching Assistant
(September 2011 - June 2012)
- Led weekly 2-hour long meetings with 16 students in order to achieve a consensus and deepen their understanding of course materials.
National Taiwan University
Research Assistant
(February 2010 - June 2012)
- Led a team of three to develop questionnaires, generate an online survey and analyze qualitative and quantitative data.
- Worked with professor De Backer to study dining habits of Taiwanese students.
- Studied online games to understand habits of regular users to establish a baseline for types of users.
